I need some help building the project, as the .sln doesn't load in Visual Studio and the start button appears as attach. Can I get a full tutorial on how to build the program?
It is a Windows-only program so you need to be on Windows Vista or higher. You also need the .NET 4.7.1 SDK installed to build it and an internet connection so some dependencies are installed from within Visual Studio. I use Visual Studio 2019 but it should still work in 2017 as far as I can tell, and that's all you need.
Yes, but nothing beyond that is supported because on GBA the only way to get more space is with a "bank switcher" chip which I do not wish to emulate or detect (not that any official cartridge with a bank switcher chip uses the engines I support anyway)